I went cheap.
I got the Denali headlight housings from ebay, then put HIR bulbs in them. I was told by the max lumens guy that the HID would work in the Denali projectors but since they were not designed for HID they wouldn't work 100%. IDK. He said something about getting an Acura projector housing and putting it into the Denali headlight.
I'm not that ambitious when it comes to non=performance mods.
Basically, Denali headlights, HIR bulbs in all 4 = way better than stock headlights for $300 total. I don't even have the "all on high" mod done. I like it, especially since we have 20 hours of night now.
Also, GMC trucks look about 1000 x better with Denali headlights, me thinks.